Illumination diffuser



FIG. 1 is a front perspective view of an illumination diffuser;

FIG. 2 is a front side elevation view thereof with the rear side elevation view being a mirror image of the front side elevation view;

FIG. 3 is a left side elevation view thereof with the right side elevation view being a mirror image of the left side elevation view;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

CLAIM The ornamental design for an illumination diffuser, as shown and described. 